The VP180 is a 4 ohm speaker. My AVR is rated down to 6 ohms. Denon X4000. I was looking at investing a 4 ohm stable mono block for the VP180 and they are few unless you have lots of money e.g. QSC ISA280. I wonder about a few things 1. can I use the preamp output of the X4000s center channel to a stereo amp and get output from both channels? If so can the VP180 be wired as if it was two speakers?